Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server.

[1337BeerCan]

The above error message is the only result I get when I click "Start" On Qjackctrl.

It complains about dlls that are not drivers. Maybe they're not, but they are present in C:\Program Files\JACK2\jack

This is a fresh install (64 bit).

What obvious thing am I missing?

[MonstoBusta]

1.9.22 just doesn't work for me either. Roll back to 1.9.21 and see if that version works. That, or running a nightly build under Actions, which is what I did.